A damning report into extremist infiltration of Birmingham schools has uncovered evidence of "coordinated, deliberate and sustained action to introduce an intolerant and aggressive Islamist ethos into some schools in the city".

The conclusion emerges from a leaked draft of a report, commissioned by the former education secretary Michael Gove and written by Peter Clarke, the former head of the Metropolitan police's counterterrorism command, which is due to be published in the next 24 hours.

Access to transcripts

Clarke's investigation gained him access to transcripts of discussions on social media between senior figures at Park View Academy, one of the schools at the heart of the row. Heasserts: "The all-male group discussions include explicit homophobia, highly offensive comments about British service personnel, a stated ambition to increase segregation at the school, disparagement of Muslims in sectors other than their own, scepticism about the truth of reports on the murder of [soldier] Lee Rigby and the Boston bombings, and a constant undercurrent of anti-western, anti-America and anti-Israel sentiment."

A Birmingham council source said: "The performance of Birmingham in raising school attainment has recently been lauded despite the level of deprivation seen in the city."

He added: "Time and again people who have either been teachers or governors at Park View appear to be involved in behaviour at other schools that have destabilised headteachers, sometimes leading to their resignation or removal. The tactics that have been used are too similar, the individuals concerned are too closely linked and the behaviour of a few parents and governors too orchestrated for there not to be a degree of coordination behind what has happened."